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Battle.net is Blizzard Entertainment's centralized account system for all their online games including World of Warcraft. For the time being the old site is still online for usage at classic.battle.net (the EU version is no longer available).

Starting with the Diablo III beta test, a new feature called Battle.net Balance will be available to store virtual currency purchased with real money to buy game-related services (character transfers, digital products like companions, and items in Diablo III's real-money auction house).

On Oct. 12, 2009, it was announced that WoW accounts would need to be converted into Battle.net accounts within 30 days. This is mandatory, as a Battle.net account will be required to log into the game after Nov. 11, and anyone who wants to start a new WoW account has to make a Battle.net account first. Anyone who had converted their account before Nov. 11 would be mailed in-game a new penguincompanion in thanks for converting early, starting later the week of the announcement.[1] The first [Unhatched Mr. Chilly] companions were mailed to players three days later, on Oct. 15, 2009.

Once your WoW account has been converted, the current expansion that you play will show up as a 'merged game' in your Battle.net account. If your WoW account has an authenticator attached to it, it will also be transferred over.

Around mid-January 2014, the look of the front page blog listing and the bylines on the battle.net community sites. The listing added larger thumbnails on the left and the bylines were simplified (originally in the US form "by authormonth #, yearhh:mm AM/PM TZ" and changed to "authorMM/DD/YYYY"; EU form "by author # monthYYYYhh:mmTZ" and changed to "authorDD/MM/YYYY").

When the Starcraft II beta was upcoming, Blizzard allowed people with a battle.net account to opt-in for it. However they require you to have at least 1 Blizzard game linked with your battle.net account.

Your Battle.net account is directly linked to your Blizzard Store account and purchases should show up on your Battle.net account. So far Battle.net Balance cannot be used to purchase from the Blizzard Store.[4]

There is no advanced search (not requiring special codes) for the forums.

New versions of previous Blizzard single-player games (Diablo III, StarCraft 2) are now force to connect to Battle.net for authentication continuously while playing the game, even when no actual gameplay content is being provided over the network.